Mary Riley was born and brought up in Nova Scotia. After graduating from Mount Saint Vincent and Carleton universities she worked as a journalist for the Calgary Herald and for the Canadian Press in Ottawa. In 1970 she went to West Africa with CUSO where she taught at the University of Lagos, Nigeria, and the University of Ghana. Following graduate work at Simon Fraser University, she taught in the public relations program at Mount Saint Vincent University in Halifax until her retirement in 2008.